CN115216138A - Preparation method of high-transparency easy-to-machine-form thermoplastic polyurethane elastomer - Google Patents
Preparation method of high-transparency easy-to-machine-form thermoplastic polyurethane elastomer Download PDFInfo
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Abstract
The invention belongs to the field of thermoplastic elastomers, and particularly relates to a preparation method and application of a high-transparency easy-processing thermoplastic polyurethane elastomer. The invention adds macromolecule nucleating agent mPCS in the TPU substrate, the mPCS has the function of providing heterogeneous nucleation points and plays the role of crystal nucleus in resin, on one hand, the crystal grain size of the TPU is reduced, when incident light passes through closely arranged fine spherulites, scattering and refraction can hardly occur at the interface of a crystal region and an amorphous region when visible light passes through a polymer, and the light transmission of the thermoplastic polyurethane is obviously improved; on the other hand, the crystallization temperature of the TPU is moved to a high temperature direction by adding the mPCS, the polymer melt can be crystallized and hardened at a higher temperature, the crystallization rate is accelerated, and the time from the molten state to the demolding, hardening and cooling of the polymer is shortened, so that the processing and forming time is shortened, and the processing and forming property of the thermoplastic polyurethane is improved.
Description
Technical Field
The invention belongs to the field of thermoplastic elastomers, and particularly relates to a preparation method and application of a high-transparency easy-processing thermoplastic polyurethane elastomer.
Background
Thermoplastic Polyurethane (TPU) has both the characteristics of plastics and elastomers, has excellent properties such as excellent wear resistance and flexibility, and is widely applied to the fields of automobiles, medical treatment, sports, buildings and the like. However, the TPU material still has some defects, such as high production cost, and the disadvantage that transparency and mechanical property can not be considered simultaneously, and the like, so that the application of the TPU is limited.
The defects of the thermoplastic polyurethane are mainly poor transparency and easy aging, and the transparency and glossiness in the aspects of packaging, daily necessities, medical appliances and the like and the appearance of products are lack of aesthetic feeling, so that the application of the thermoplastic polyurethane is severely limited, the problem can be effectively solved by performing anti-reflection modification on the thermoplastic polyurethane, the anti-reflection modification is a necessary condition for realizing high performance and high transparency of the thermoplastic polyurethane, and the application range of the thermoplastic polyurethane can be enlarged.
In the production process of polymers, cooling and demolding are important links, and the time required for producing a complete process is related. The shorter the time required, the more efficient the production, the shorter the time spent on the same batch of samples or the more samples produced at the same time, and the product profit can be maximized. The improvement of the formability of the TPU increases the production efficiency, the yield of the finished product in the same time is more, the time required for the same amount of the product is shorter, and the operation cost of the company is reduced, which has an important influence on the reduction of the overall cost of the company.
Therefore, the development of a TPU with high light transmittance and excellent processing and forming performances becomes a research hotspot.
Disclosure of Invention
The invention aims to provide a preparation method of a high-transparency easy-processing thermoplastic polyurethane elastomer, which has good transparency and processing formability and overcomes the defects of the prior art.
In order to achieve the purpose, the invention adopts the following technical scheme:
a high-transparency thermoplastic polyurethane elastomer easy to process and form is prepared by taking small-size poly (N-tert-butyl acrylate-styrene) microspheres mPCS as a high-molecular nucleating agent, wherein the high-molecular nucleating agent can be uniformly distributed in a resin matrix, and the high-molecular nucleating agent is crystallized first in the cooling process to provide crystal nuclei for TPU. Adding a macromolecular nucleating agent mPCS into a thermoplastic polyurethane elastomer (TPU) matrix to prepare the high-transparency easy-to-process thermoplastic polyurethane elastomer.
The method comprises the following steps:
a preparation method of a high-transparency easy-processing thermoplastic polyurethane elastomer specifically comprises the following steps:
(1) Preparation of mPCS: 13 ml of N-propenyl carbamic acid tert-butyl ester, 19 ml styrene monomer and 80 ml absolute ethyl alcohol are weighed, and 0.5 g Benzoyl Peroxide (BPO) is weighed. 0.5 g initiator BPO and 13 ml of N-propenyl carbamic acid tert-butyl ester and 19 ml styrene monomer are added into a 50 ml beaker for ultrasonic dispersion for 10 min, so that the BPO is uniformly dispersed in the N-propenyl carbamic acid tert-butyl ester and the styrene monomer, and then the mixture is transferred into a three-neck flask provided with a stirrer and a condensing tube. Accurately measuring 3 g dispersant polyvinylpyrrolidone (PVP) and 80 ml absolute ethyl alcohol, adding the mixture into a 250 ml beaker, ultrasonically dispersing for 10 min, slowly adding the mixture into a three-neck flask, reacting for 12 h under magnetic stirring at 80 ℃, and purging with nitrogen in the whole reaction process. And transferring the reaction solution into a centrifugal tube after the reaction is finished, settling for 10 min in a high-speed centrifuge with the rotating speed of 9000 r/min, discarding the supernatant, adding 50 ml absolute ethyl alcohol to wash the microspheres at the lower layer, centrifuging and washing, and repeating for 3 times. Ultrasonically dispersing the washed microspheres in 50 ml deionized water, and drying by a freeze dryer to obtain the mPCS.
(2) Preparation of thermoplastic polyurethane elastomer: weighing 46.75 parts of polyethylene glycol, heating and melting the polyethylene glycol in an oven at 100 ℃, preserving heat at 105 ℃ for later use, and covering the polyethylene glycol with tinfoil paper to prevent water absorption; weighing 42.6 parts of diphenylmethane diisocyanate, heating the diphenylmethane diisocyanate in an oven (at 70-80 ℃) to melt the diphenylmethane diisocyanate, and keeping the temperature at 70 ℃ for later use; weighing 10.65 parts of 1,4-butanediol, melting and preserving heat in an oven at 80 ℃, preserving heat for later use, and covering with tin foil paper to prevent water absorption. Uniformly mixing 46.75 parts of polyethylene glycol and 10.65 parts of 1,4-butanediol, adding 0.3-0.5 part of mPCS and 2 drops of dibutyltin dilaurate catalyst, adding 42.6 parts of diphenylmethane diisocyanate into the alcohol mixture, vigorously stirring by a stirring paddle until the temperature in the reactant is 180-220 ℃, mixing the effluent liquid on a polytetrafluoroethylene iron disk, putting the polytetrafluoroethylene iron disk into an oven, heating to 85 ℃, keeping the temperature for 35 min, taking out, and curing at room temperature for 24 h. After the curing is completed, the white agglomerates are introduced into a crushing system to be crushed into TPU granules. Before extrusion, putting TPU granules in an oven at 120 ℃ for drying 4 h, putting the small blocks of thermoplastic polyurethane into an extruder for heating and melting, adding 10 ml polyamide serving as a lubricant, then extruding the thermoplastic polyurethane and solidifying by a water cooling system to obtain the transparent flaky small solid.
The thermoplastic polyurethane elastomer with high transparency and easy processing and forming prepared by the preparation method has the advantages of low raw material cost, easy preparation, simple preparation method of products, easy operation of the preparation process and no generation of toxic gas in the process. The produced thermoplastic polyurethane elastomer has high transparency and good processing formability.
The invention has the beneficial effects that:
1. poly (N-propenyl carbamic acid tert-butyl ester) -styrene microspheres (mPCS) with smaller size (the particle size range is 50-120 nm) can be used as a macromolecular nucleating agent, the development of the macromolecular nucleating agent solves the defects of poor dispersibility and compatibility of inorganic and organic nucleating agents according to a similar compatibility principle, and the polymer nucleating agent with high relative molecular mass has better compatibility and dispersibility with a polymer matrix compared with the inorganic compound nucleating agent with low relative molecular mass and the organic compound nucleating agent with low relative molecular mass, which are not possessed by the small molecular nucleating agent.
2. In the melting process of the TPU, the high-molecular nucleating agent can be uniformly distributed in the resin matrix, and in the cooling process, the high-molecular nucleating agent is firstly crystallized to provide crystal nuclei for the TPU. The crystallization behavior of the resin can be changed by adding the mPCS, so that the crystallization speed is accelerated, the crystallization temperature is increased, the molding period is shortened, and the physical properties of the product are improved. On the other hand, the addition of mPCS increases the crystallinity of the polymer and refines the grain size, resulting in increased light transmittance, increased transparency, and improved gloss.
3. The addition of the mPCS converts the self-nucleation into the heterogeneous nucleation, the mPCS is firstly crystallized in the cooling process of the polymer melt to provide crystal nuclei for the polymer, the crystallization rate is accelerated, the size of correspondingly formed spherulites is smaller, and when incident light passes through the closely arranged fine spherulites, visible light can hardly scatter and refract at the interface of a passing crystal region and an amorphous region when passing through the polymer, so that the light transmission of the thermoplastic polyurethane is obviously improved.
4. The reason why the processing and molding time of thermoplastic polyurethane is shortened is that the addition of mPCS leads to the formation of polymer knots
The crystallization temperature moves towards the high temperature direction, the polymer melt can be crystallized and hardened at a higher temperature, the crystallization rate is accelerated, and the time from the molten state to the demolding, hardening and cooling of the polymer is shortened, so that the processing and forming time is shortened, and the processing and forming property of the thermoplastic polyurethane is improved.
Drawings
FIG. 1 is a scanning electron microscope image of mPCS prepared by the present invention.
Detailed Description
The present invention will be further described with reference to the following examples, but the present invention is not limited to these examples.
Example 1
A preparation method of a high-transparency easy-processing thermoplastic polyurethane elastomer comprises the following raw materials in parts by weight: 46.75 parts of polyethylene glycol, 10.65 parts of 1,4-butanediol, 42.6 parts of diphenylmethane diisocyanate and 0.3 part of macromolecular nucleating agent mPCS.
The molecular weight of the polyethylene glycol is 1000.
The 1,4-butanediol is colorless viscous oily liquid, and the hydroxyl value is 1000 to 1200 mg KOH/g.
The preparation of the high-transparency easy-processing thermoplastic polyurethane elastomer comprises the following steps:
(1) Preparation of mPCS: 13 ml of N-propenyl carbamic acid tert-butyl ester, 19 ml styrene monomer and 80 ml absolute ethyl alcohol are weighed, and 0.5 g Benzoyl Peroxide (BPO) is weighed. 0.5 g initiator BPO and 13 ml N-propenyl carbamic acid tert-butyl ester and 19 ml styrene monomer are added into a 50 ml beaker for ultrasonic dispersion for 10 min, so that the BPO is uniformly dispersed in the N-propenyl carbamic acid tert-butyl ester and the styrene monomer, and then the mixture is transferred into a three-neck flask with a stirrer and a condensing pipe. Accurately measuring 3 g dispersant polyvinylpyrrolidone (PVP) and 80 ml absolute ethyl alcohol, adding the mixture into a 250 ml beaker, ultrasonically dispersing for 10 min, slowly adding the mixture into a three-neck flask, reacting for 12 h under magnetic stirring at 80 ℃, and purging with nitrogen in the whole reaction process. And transferring the reaction solution into a centrifugal tube after the reaction is finished, settling for 10 min in a high-speed centrifuge with the rotating speed of 9000 r/min, discarding the supernatant, adding 50 ml absolute ethyl alcohol to wash the microspheres at the lower layer, centrifuging and washing, and repeating for 3 times. And ultrasonically dispersing the washed microspheres in 50 ml deionized water, and drying by using a freeze dryer to obtain the mPCS.
(2) Preparation of thermoplastic polyurethane elastomer: weighing 46.75 parts of polyethylene glycol, heating and melting the polyethylene glycol in an oven at 100 ℃, preserving the temperature at 105 ℃ for later use, and covering the polyethylene glycol with tinfoil paper to prevent water absorption; weighing 42.6 parts of diphenylmethane diisocyanate, heating the diphenylmethane diisocyanate in an oven (at 70-80 ℃) to melt the diphenylmethane diisocyanate, and preserving the heat at 70 ℃ for later use; weighing 10.65 parts of 1,4-butanediol, melting and preserving heat in an oven at 80 ℃, preserving heat for later use, and covering with tin foil paper to prevent water absorption. Uniformly mixing 46.75 parts of polyethylene glycol and 10.65 parts of 1,4-butanediol, adding 0.3 part of mPCS and 2 drops of dibutyltin dilaurate catalyst, adding 42.6 parts of diphenylmethane diisocyanate into the alcohol mixture, vigorously stirring by a stirring paddle until the temperature in the reactant is 180-220 ℃, mixing the effluent liquid on a polytetrafluoroethylene iron disk, putting the polytetrafluoroethylene iron disk into an oven, heating to 85 ℃, keeping the temperature for 35 min, taking out, and curing at room temperature for 24 h. After the curing is finished, the white agglomerates are introduced into a crushing system to be crushed into TPU granules. Before extrusion, putting TPU granules in an oven at 120 ℃ for drying 4 h, putting the small blocks of thermoplastic polyurethane into an extruder for heating and melting, adding 10 ml polyamide serving as a lubricant, then extruding the thermoplastic polyurethane and solidifying by a water cooling system to obtain the transparent flaky small solid.
Example 2
A preparation method of a high-transparency easy-processing thermoplastic polyurethane elastomer comprises the following raw materials in parts by weight: 46.75 parts of polyethylene glycol, 10.65 parts of 1,4-butanediol, 42.6 parts of diphenylmethane diisocyanate and 0.4 part of macromolecular nucleating agent mPCS.
The molecular weight of the polyethylene glycol is 1000.
The 1,4-butanediol is colorless viscous oily liquid, and the hydroxyl value is 1000 to 1200 mg KOH/g.
The preparation of the high-transparency easy-processing thermoplastic polyurethane elastomer comprises the following steps:
(1) Preparation of mPCS: 13 ml of N-propenyl carbamic acid tert-butyl ester, 19 ml styrene monomer and 80 ml absolute ethyl alcohol are weighed, and 0.5 g Benzoyl Peroxide (BPO) is weighed. 0.5 g initiator BPO and 13 ml N-propenyl carbamic acid tert-butyl ester and 19 ml styrene monomer are added into a 50 ml beaker for ultrasonic dispersion for 10 min, so that the BPO is uniformly dispersed in the N-propenyl carbamic acid tert-butyl ester and the styrene monomer, and then the mixture is transferred into a three-neck flask with a stirrer and a condensing pipe. Accurately measuring 3 g dispersant polyvinylpyrrolidone (PVP) and 80 ml absolute ethyl alcohol, adding the mixture into a 250 ml beaker, ultrasonically dispersing for 10 min, slowly adding the mixture into a three-neck flask, reacting for 12 h under magnetic stirring at 80 ℃, and purging with nitrogen in the whole reaction process. And transferring the reaction solution into a centrifugal tube after the reaction is finished, settling for 10 min in a high-speed centrifuge with the rotating speed of 9000 r/min, discarding the supernatant, adding 50 ml absolute ethyl alcohol to wash the microspheres at the lower layer, centrifuging and washing, and repeating for 3 times. Ultrasonically dispersing the washed microspheres in 50 ml deionized water, and drying by a freeze dryer to obtain the mPCS.
(2) Preparation of thermoplastic polyurethane elastomer: weighing 46.75 parts of polyethylene glycol, heating and melting the polyethylene glycol in an oven at 100 ℃, preserving the temperature at 105 ℃ for later use, and covering the polyethylene glycol with tinfoil paper to prevent water absorption; weighing 42.6 parts of diphenylmethane diisocyanate, heating the diphenylmethane diisocyanate in an oven (at 70-80 ℃) to melt the diphenylmethane diisocyanate, and keeping the temperature at 70 ℃ for later use; weighing 10.65 parts of 1,4-butanediol, melting and preserving heat in an oven at 80 ℃, preserving heat for later use, and covering with tin foil paper to prevent water absorption. Uniformly mixing 46.75 parts of polyethylene glycol and 10.65 parts of 1,4-butanediol, adding 0.4 part of mPCS and 2 drops of dibutyltin dilaurate catalyst, adding 42.6 parts of diphenylmethane diisocyanate into the alcohol mixture, vigorously stirring by a stirring paddle until the temperature in the reactant is 180-220 ℃, mixing the effluent liquid on a polytetrafluoroethylene iron disk, putting the polytetrafluoroethylene iron disk into an oven, heating to 85 ℃, keeping the temperature for 35 min, taking out, and curing at room temperature for 24 h. After the curing is completed, the white agglomerates are introduced into a crushing system to be crushed into TPU granules. Before extrusion, putting TPU granules in an oven at 120 ℃ for drying 4 h, putting small blocks of thermoplastic polyurethane into an extruder for heating and melting, adding 10 ml polyamide serving as a lubricant, and then extruding the thermoplastic polyurethane and solidifying by a water cooling system to obtain transparent flaky small solids.
Example 3
A preparation method of a high-transparency easy-processing thermoplastic polyurethane elastomer comprises the following raw materials in parts by weight: 46.75 parts of polyethylene glycol, 10.65 parts of 1,4-butanediol, 42.6 parts of diphenylmethane diisocyanate and 0.5 part of macromolecular nucleating agent mPCS.
The molecular weight of the polyethylene glycol is 1000.
The 1,4-butanediol is colorless viscous oily liquid, and the hydroxyl value is 1000 to 1200 mg KOH/g.
The preparation of the high-transparency easy-processing thermoplastic polyurethane elastomer comprises the following steps:
(1) Preparation of mPCS: 13 ml of N-propenyl carbamic acid tert-butyl ester, 19 ml styrene monomer and 80 ml absolute ethyl alcohol are weighed, and 0.5 g Benzoyl Peroxide (BPO) is weighed. 0.5 g initiator BPO and 13 ml of N-propenyl carbamic acid tert-butyl ester and 19 ml styrene monomer are added into a 50 ml beaker for ultrasonic dispersion for 10 min, so that the BPO is uniformly dispersed in the N-propenyl carbamic acid tert-butyl ester and the styrene monomer, and then the mixture is transferred into a three-neck flask provided with a stirrer and a condensing tube. Accurately measuring 3 g dispersant polyvinylpyrrolidone (PVP) and 80 ml absolute ethyl alcohol, adding the mixture into a 250 ml beaker, ultrasonically dispersing for 10 min, slowly adding the mixture into a three-neck flask, reacting for 12 h under magnetic stirring at 80 ℃, and purging with nitrogen in the whole reaction process. And transferring the reaction solution into a centrifugal tube after the reaction is finished, settling for 10 min in a high-speed centrifuge with the rotating speed of 9000 r/min, discarding the supernatant, adding 50 ml absolute ethyl alcohol to wash the microspheres at the lower layer, centrifuging and washing, and repeating for 3 times. And ultrasonically dispersing the washed microspheres in 50 ml deionized water, and drying by using a freeze dryer to obtain the mPCS.
(2) Preparation of thermoplastic polyurethane elastomer: weighing 46.75 parts of polyethylene glycol, heating and melting the polyethylene glycol in an oven at 100 ℃, preserving the temperature at 105 ℃ for later use, and covering the polyethylene glycol with tinfoil paper to prevent water absorption; weighing 42.6 parts of diphenylmethane diisocyanate, heating the diphenylmethane diisocyanate in an oven (at 70-80 ℃) to melt the diphenylmethane diisocyanate, and keeping the temperature at 70 ℃ for later use; weighing 10.65 parts of 1,4-butanediol, melting and preserving heat in an oven at 80 ℃, preserving heat for later use, and covering with tinfoil paper to prevent water absorption. Uniformly mixing 46.75 parts of polyethylene glycol and 10.65 parts of 1,4-butanediol, adding 0.5 part of mPCS and 2 drops of dibutyltin dilaurate catalyst, adding 42.6 parts of diphenylmethane diisocyanate into the alcohol mixture, vigorously stirring by a stirring paddle until the temperature in the reactant is 180-220 ℃, mixing the effluent liquid on a polytetrafluoroethylene iron disk, putting the polytetrafluoroethylene iron disk into an oven, heating to 85 ℃, keeping the temperature for 35 min, taking out, and curing at room temperature for 24 h. After the curing is completed, the white agglomerates are introduced into a crushing system to be crushed into TPU granules. Before extrusion, putting TPU granules in an oven at 120 ℃ for drying 4 h, putting the small blocks of thermoplastic polyurethane into an extruder for heating and melting, adding 10 ml polyamide serving as a lubricant, then extruding the thermoplastic polyurethane and solidifying by a water cooling system to obtain the transparent flaky small solid.
Table 1 shows the measurements of the transmittance, haze and molding time of the samples
As can be seen from Table 1, the light transmittance of the TPU material added with the polymer nucleating agent mPCS is obviously higher than that of pure TPU, the processing and forming time is obviously lower than that of pure TPU, and the optimal addition amount is 0.4 wt.
TABLE 2 test standards
It can be seen from FIG. 1 that poly (t-butyl N-propenyl carbamate) -styrene microspheres (mPCS) have a spherical particle size ranging from 50 to 120 nm.
Claims (10)
1. A preparation method of a high-transparency easy-processing thermoplastic polyurethane elastomer is characterized by comprising the following steps: the preparation method comprises the steps of taking poly (N-tert-butyl propenyl carbamate) -styrene microspheres mPCS as a high-molecular nucleating agent, adding the mPCS into a thermoplastic polyurethane elastomer TPU substrate, and preparing the high-transparency thermoplastic polyurethane elastomer easy to process and form.
2. The preparation method of the thermoplastic polyurethane elastomer with high transparency and easy processing and molding as claimed in claim 1, wherein the preparation method of the poly (t-butyl N-propenyl carbamate) -styrene microsphere mPCS specifically comprises the following steps:
(1) Measuring 13 ml of N-propenyl carbamic acid tert-butyl ester, 19 ml styrene monomer and 80 ml absolute ethyl alcohol, and weighing 0.5 g initiator Benzoyl Peroxide (BPO) for later use;
(2) Adding BPO, tert-butyl N-propenyl carbamate and a styrene monomer into a 50 ml beaker for ultrasonic dispersion for 10 min, so that the BPO is uniformly dispersed in the tert-butyl N-propenyl carbamate and the styrene monomer, and then transferring the mixture into a three-neck flask with a stirrer and a condensing tube;
(3) Accurately measuring 3 g dispersant polyvinylpyrrolidone PVP and 80 ml absolute ethyl alcohol, adding into a 250 ml beaker, performing ultrasonic dispersion for 10 min, slowly adding into the three-neck flask obtained in the step (2), performing magnetic stirring, and performing nitrogen purging in the whole reaction process;
(4) After the reaction is finished, transferring the reaction solution obtained in the step (3) into a centrifuge tube, centrifuging in a high-speed centrifuge, settling for 10 min, removing the supernatant, adding absolute ethyl alcohol to wash the microspheres on the lower layer, centrifuging and washing, and repeating for 3 times; ultrasonically dispersing the washed microspheres in deionized water, and drying by using a freeze dryer to obtain the mPCS.
3. The method for preparing the thermoplastic polyurethane elastomer with high transparency and easy processing and forming as claimed in claim 2, wherein the magnetic stirring in the step (3) is specifically reaction at 80 ℃ of 12 h under magnetic stirring.
4. The method for preparing the thermoplastic polyurethane elastomer with high transparency and easy processing and forming as claimed in claim 2, wherein the rotational speed of the centrifugation in the step (4) is 9000 r/min.
5. The preparation method of the thermoplastic polyurethane elastomer with high transparency and easy processing and forming as claimed in claim 1 is characterized by comprising the following specific preparation steps:
(1) Weighing polyethylene glycol, heating and melting in an oven at 100 deg.C, keeping at 105 deg.C for use, and covering with tinfoil paper to prevent water absorption;
(2) Weighing diphenylmethane diisocyanate, heating in an oven at 70-80 deg.C for melting, and keeping the temperature at 70 deg.C for use;
(3) Weighing 1,4-butanediol, melting and preserving heat in an oven at 80 ℃, preserving heat for later use, and covering with tinfoil paper to prevent water absorption;
(4) Uniformly mixing the polyethylene glycol obtained in the step (1) with 1,4-butanediol obtained in the step (3), adding mPCS and 2 drops of dibutyltin dilaurate catalyst, adding the diphenylmethane diisocyanate obtained in the step (2) into the alcohol mixture, violently stirring, mixing the effluent liquid on a polytetrafluoroethylene iron disc, putting the polytetrafluoroethylene iron disc into an oven for heat preservation, and curing at room temperature for 24 h;
(5) After the curing is finished, the white blocks are led into a crushing system to be crushed into TPU granules, the TPU granules are dried before extrusion, small blocks of thermoplastic polyurethane are placed into an extruding machine to be heated and melted, 10 ml polyamide is added to serve as a lubricant, then the thermoplastic polyurethane is extruded and is solidified through a water cooling system, and transparent flaky small solids are obtained.
6. The method for preparing the thermoplastic polyurethane elastomer with high transparency and easy processing and forming according to claim 5, is characterized in that: the raw materials comprise the following components in parts by weight: 46.75 parts of polyethylene glycol, 10.65 parts of 1,4-butanediol, 42.6 parts of diphenylmethane diisocyanate and 0.3 to 0.5 part of macromolecular nucleating agent mPCS.
7. The method for preparing the thermoplastic polyurethane elastomer with high transparency and easy processing and forming as claimed in claim 5, wherein the method comprises the following steps: the violent stirring in the step (4) is that a stirring paddle vigorously stirs until the temperature in the reactant is 180-220 ℃.
8. The method for preparing the thermoplastic polyurethane elastomer with high transparency and easy processing and forming as claimed in claim 5, wherein the method comprises the following steps: and (5) keeping the temperature of the oven in the step (4), specifically, keeping the temperature for 35 min after the temperature is raised to 85 ℃.
9. The method for preparing the thermoplastic polyurethane elastomer with high transparency and easy processing and forming according to claim 5, is characterized in that: and (5) drying, namely drying 4 h in an oven at 120 ℃.
10. A highly transparent, easily processable thermoplastic polyurethane elastomer prepared by the process according to any one of claims 1 to 9.
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